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| Vibration Fatigue Life Analysis of Stiffened Plates under Complex Loads |
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| DOI：10.7643/issn.1672-9242.2022.09.003 |
| KeyWord:stiffened plate complex load Von Mises stress vibration fatigue life prediction |
| Author | Institution |
| XIONG Jia-lin |
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| WANG Ke |
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZHOU Su-feng |
China Aircraft Strength Research Institute, Xi'an , China |
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| Abstract: |
| This paper aims to study the vibration fatigue life prediction of aeronautical engineering structural component-stiffened plate under the combined loading of quasi-static load and random dynamic load. A finite element model is established for a milled aluminum alloy notched reinforced plate, and the fatigue life analysis under combined static and dynamic loading is carried out by using the time domain method. Firstly, the quasi-static load is decomposed into static force and sinusoidal excitation, and the static force result is used as the average stress to correct the S-N curve, and then the random response analysis is used to calculate the stress PSD function of the dangerous point of the structure under the action of dynamic load alone. After the time domain signal in the random loading process is extracted by the inverse Fourier transform method, the Von Mises equivalent criterion is applied to superimpose it with the sinusoidal excitation time domain sample to obtain the fatigue analysis stress spectrum. Combined with Miner's linear accumulation theory and the rain flow cycle counting method, the fatigue life of stiffened plate structure under combined static and dynamic loading is calculated. Through finite element simulation analysis and calculation, the vibration fatigue life of the stiffened plate under the combined action of static and dynamic loads is obtained, and the life error of the comparative test is basically within twice the bounds. The comparison between the calculation and the experimental results shows that the method can effectively predict the fatigue life of the test specimen under the combined static and dynamic load, and can be further extended to the fatigue life prediction problem under similar loads. |
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